<![CDATA[The purpose of this study includes three important things, including the effect of coastal air on the coastal environment, corrosion rate, and hardness of the Heli Hughes-300C propeller. The method used is a qualitative approach using a corrosion rate measuring device, namely Cell 3 Electrodes with liquid seawater from Maron Beach, Semarang as a corrosion medium. Each specimen will be tested for composition, calculated corrosion rate and tested for hardness. Specimen Making: Specimen making for this test was carried out by taking part of the Hughes 300C Helicopter propeller and then forming it to the size of the tube. Composition test: The composition test was carried out at the UGM Engineering Materials Laboratory using a spectrometer. Based on the results above, it was found that the Hughes 300C propeller after being corroded had a higher hardness value (average VHN 135.75kgf/mm2) compared to the one before it was corroded (average VHN 128.79 kgf/mm2). These results indicate that the propeller after being corroded will be more rigid, where there is a shift in the hardness standard value of the propeller. A brittle propeller will break more easily when it hits a hard impact in the air compared to a low-friction propeller due to the movement of the flap on the propeller when the blade angle changes and the push from the wind when flying.]]>
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